Contents
What metrics are used to route MPLS traffic?
When MPLS TE is configured in a network, the IGP floods two metrics for every link: the normal IGP (OSPF or IS-IS) link metric and a TE link metric. The IGP uses the IGP link metric in the normal way to compute routes for destination networks.
Which routing protocols support MPLS traffic engineering?
Prerequisites for MPLS Traffic Engineering and Enhancements Your network must support the following Cisco IOS XE features before you enable MPLS traffic engineering: Multiprotocol Label Switching. IP Cisco Express Forwarding. Intermediate System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF)
Which two protocols below you can choose as the routing protocol for MPLS TE?
There are two standardized protocols for managing MPLS paths: the Label Distribution Protocol (LDP) and RSVP-TE, an extension of the Resource Reservation Protocol (RSVP) for traffic engineering. Furthermore, there exist extensions of the Border Gateway Protocol (BGP) that can be used to manage an MPLS path.
What IS MPLS TE tunnel?
The Multiprotocol Label Switching (MPLS) Traffic Engineering (TE): Tunnel Source feature allows you to specify the IP address assigned to an interface as the source IP address for control packets.
What is the goal of MPLS traffic engineering?
The goal of Traffic Engineering is to facilitate efficient and reliable IP network operations while simultaneously optimizing resource utilization and network performance. Prior to MPLS TE, this technique is possible with either IP or ATM depending on the protocol used between a pair of edge routers in a network.
What are the components of MPLS TE?
MPLS TE uses an extension for existing protocols (Intermediate System-to-Intermediate System (IS-IS), Resource Reservation Protocol (RSVP), OSPF) to calculate and establish unidirectional tunnels that are configured according to the network restriction.
What are two characteristics of MPLS TE tunnels?
Correct Answer: B
- They are unidirectional.
- The headend and tailend routers of the tunnel must have a BGP relationship.
- They are run over Ethernet cores only.
- They use RSVP to provide bandwidth for the tunnel.
- They require EIGRP to be running in the core.
Why is MPLS faster?
MPLS is much faster than traditional IP Routing, as it is based on the concept of the label to allow forwarding (rather switching) of packets. This type of forwarding is more efficient as it avoids overloading the CPU.
How are Te tunnels used in a MPLS network?
In an MPLS network, all pertinent tunnel configurations are always performed or provider edge (PE) routers. The TE tunnels or LSPs will be used to link the edge routers across the core of the service provider network. MPLS TE can also map to certain classes of traffic versus destinations.
Do you need to disable LDP on MPLS tunnel?
Thus, PE1 uses the TE label to reach PE2. Note: MPLS TE is independent of LDP, which means that, if you have a full mesh of tunnels from PE to PE, you can effectively disable LDP in the routers and do not need to run LDP on the TE tunnel interfaces. However, you must build all tunnels to the BGP next hop of the VPN version 4 (VPNv4) routes.
What do you need to know about MPLS Traffic Engineering?
MPLS Traffic Engineering (MPLS TE) is a growing implementation in today’s service provider networks. MPLS adoption in service provider networks has increased manifold due to its inherent TE capabilities. This chapter provides you with information on the operation and configuration of MPLS TE on Cisco routers.
How is traffic forwarded along a Te tunnel?
Traffic is forwarded along the path defined as the TE tunnel by using MPLS label switching. Hence, TE tunnels are assigned specific label switched paths (LSPs) in the network from source to destination, which are usually PE routers.